公开(公告)号：US09008262B2

公开(公告)日：2015-04-14

申请号：US13720184

申请日：2012-12-19

申请人： Satoru Nakanishi

发明人： Satoru Nakanishi

IPC分类号： G01N23/083 ,  G06K9/44 ,  G06K9/60 ,  G06T11/00 ,  G01N23/04 ,  A61B6/03 ,  A61B6/00

CPC分类号： G06T11/003 ,  A61B6/032 ,  A61B6/5205 ,  A61B6/5258 ,  G01N23/046 ,  Y10S378/901

摘要： According to one embodiment, an X-ray CT apparatus includes an generation unit, detection unit, processing unit, and reconstruction unit. The generation unit irradiates an object with X-rays. The detection unit includes detection elements corresponding to a plurality of channels, which output detection signals upon detecting X-rays. The processing unit smoothes projection data constituted by numerical values corresponding to signals output from the elements so as to more strongly smooth a portion exhibiting a larger amount of change in the numerical value. The reconstruction unit reconstructs an image by using a plurality of projection data smoothed by the image processing unit.

摘要翻译： 根据一个实施例，X射线CT装置包括生成单元，检测单元，处理单元和重建单元。 生成单元用X射线照射物体。 检测单元包括对应于多个通道的检测元件，其在检测X射线时输出检测信号。 处理单元平滑由与从元件输出的信号相对应的数值构成的投影数据，以便使显示出数值变化量大的部分更加平滑。 重建单元通过使用由图像处理单元平滑的多个投影数据来重建图像。

公开(公告)号：US08731267B2

公开(公告)日：2014-05-20

申请号：US12892091

申请日：2010-09-28

申请人： Satoru Nakanishi

发明人： Satoru Nakanishi

IPC分类号： G06K9/00

CPC分类号： A61B6/032 ,  G06T11/005

摘要： According to one embodiment, An X-ray CT apparatus includes acquisition unit, intermediate image generating unit, weighting factor calculating unit, and resultant image generating unit. The intermediate image generating unit generates a first image based on a first projection data set and a second image based on a second projection data set. The first projection data set falls within a first view angle range of projection data acquired by the acquisition unit. The second projection data set falls within a second view angle range of the projection data. The second view angle range is narrower than the first view angle range. The weighting factor calculating unit calculates a weighting factor corresponding to a pixel value difference between the first image and the second image. The resultant image generating unit generates a resultant image associated with weighted addition of the first image and the second image based on the weighting factor.

摘要翻译： 根据一个实施例，X射线CT装置包括获取单元，中间图像生成单元，加权因子计算单元和合成图像生成单元。 中间图像生成单元基于第一投影数据集和基于第二投影数据集的第二图像生成第一图像。 第一投影数据集落在由获取单元获取的投影数据的第一视角范围内。 第二投影数据集落入投影数据的第二视角范围内。 第二视角范围比第一视角范围窄。 加权系数计算单元计算与第一图像和第二图像之间的像素值差对应的加权因子。 所得到的图像生成单元基于加权因子生成与第一图像和第二图像的加权相加相关联的合成图像。

公开(公告)号：US08478013B2

公开(公告)日：2013-07-02

申请号：US12787166

申请日：2010-05-25

申请人： Satoru Nakanishi ,  Be-Shan S. Chiang

发明人： Satoru Nakanishi ,  Be-Shan S. Chiang

IPC分类号： G06K9/00 ,  A61B6/00

CPC分类号： G06T11/005 ,  G06T2211/412

摘要： As an illustration of generating a motion map, although the cardiac CT is described for selecting an optimal phase, the disclosure is not limited to the cardiac CT. For the cardiac CT, the cardiac phase map is efficiently generated based upon helical scan data, and the optimal phase is selected within a reasonable time. At the same time, the optimal phase is accurately determined based upon complementary rays as indexes for minimal movement so as to select the projection data for minimizing artifacts in reconstructed cardiac images. The helically scanned data reflect motion within the same cardiac cycle or over the continuous cardiac cycles. The application of the complementary ray technique to the helically scanned data is accomplished by three-dimensionally determining a pair of the complementary rays in order to take into account motion within the same cardiac cycle or over the continuous cardiac cycles. The absolute sum of the differences for the top ray and or the bottom ray is determined in order to determine the amount of cardiac motion.

摘要翻译： 作为生成运动图的说明，虽然描述了用于选择最佳相位的心脏CT，但是本公开不限于心脏CT。 对于心脏CT，基于螺旋扫描数据有效地生成心脏相位图，并且在合理的时间内选择最佳相位。 同时，基于互补射线作为最小运动的指标精确地确定最佳相位，以便选择用于最小化重建的心脏图像中的假象的投影数据。 螺旋扫描的数据反映在相同的心动周期或连续的心动周期内的运动。 将互补射线技术应用于螺旋扫描的数据是通过三维地确定一对互补射线来实现的，以便考虑在相同的心动周期内或在连续的心动周期上的运动。 确定顶部射线和/或底部射线的差异的绝对总和以确定心脏运动的量。

公开(公告)号：US20130101192A1

公开(公告)日：2013-04-25

申请号：US13276841

申请日：2011-10-19

申请人： Satoru NAKANISHI ,  Be-Shan CHIANG ,  Alexander ZAMYATIN

发明人： Satoru NAKANISHI ,  Be-Shan CHIANG ,  Alexander ZAMYATIN

IPC分类号： G06K9/00

CPC分类号： G06T11/006 ,  A61B6/583 ,  G06T2211/416

摘要： Cone beam artifacts arise in circular CT reconstruction. The cone beam artifacts are substantially removed by reconstructing a reference image from measured data at circular source trajectory, generating synthetic data by forward projection of the reference image along a pre-determined source trajectory, which supplements the circular source trajectory to a theoretically complete trajectory, reconstructing a correction image from the synthetic data and substantially reducing the cone beam artifacts by generating a corrected image using the reference image and the correction image.

摘要翻译： 锥形束伪影出现在圆形CT重建中。 通过从圆形源轨迹上的测量数据重建参考图像，基本上去除锥形束伪影，通过沿预定源轨迹向前投影参考图像，从而产生合成数据，该轨迹将圆形源轨迹补充到理论上完整的轨迹， 从合成数据重建校正图像，并通过使用参考图像和校正图像生成校正图像来显着减小锥形束伪影。

公开(公告)号：US08385620B2

公开(公告)日：2013-02-26

申请号：US12262283

申请日：2008-10-31

申请人： Aleksandr Zamyatin ,  Michael D. Silver ,  Satoru Nakanishi

发明人： Aleksandr Zamyatin ,  Michael D. Silver ,  Satoru Nakanishi

IPC分类号： A61B6/03

CPC分类号： G06T11/005

摘要： A computed tomography apparatus and method where data is upsampled with shifting to produce upsampled data. The data is shifted up and down in the same amount in the z-direction, and then upsampled through interpolation. An image is reconstructed using the upsampled data. The process is preferably performed column-by-column. An upsampling shift and interpolation kernel size can be adaptive to the data z-gradient.

摘要翻译： 一种计算机断层摄影装置和方法，其中数据被上采样以移位以产生上采样的数据。 数据在z方向上以相同的量上下移动，然后通过插值进行上采样。 使用上采样数据重建图像。 该方法优选逐列进行。 上采样移位和插值内核大小可以适应于数据的z-梯度。

公开(公告)号：US20120093281A1

公开(公告)日：2012-04-19

申请号：US12903508

申请日：2010-10-13

申请人： Alexander ZAMYATIN ,  Be-Shan CHIANG ,  Satoru NAKANISHI

发明人： Alexander ZAMYATIN ,  Be-Shan CHIANG ,  Satoru NAKANISHI

IPC分类号： A61B6/03

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4085 ,  A61B6/5205 ,  A61B6/5288 ,  G06T11/005 ,  G06T2211/412

摘要： Embodiments and processes of computer tomography perform tasks associated with weighting projection data based upon at least one motion index such as electrocardiogram gated reconstruction, view-based motion map and ray-based motion map. Other embodiments and processes of computer tomography perform tasks associated with weighting projection data based upon at least one motion index and another index that is associated with certain geometric characteristics of a cone beam.

摘要翻译： 计算机断层摄影的实施例和过程基于至少一个运动索引（例如心电图门控重建，基于视图的运动图和基于射线的运动图）来执行与加权投影数据相关联的任务。 计算机断层摄影的其他实施例和过程基于至少一个运动索引和与锥形束的某些几何特征相关联的另一索引来执行与加权投影数据相关联的任务。

公开(公告)号：US07953263B2

公开(公告)日：2011-05-31

申请号：US11753783

申请日：2007-05-25

申请人： Yosuke Okamoto ,  Satoru Nakanishi

发明人： Yosuke Okamoto ,  Satoru Nakanishi

IPC分类号： G06K9/00 ,  A61B6/00 ,  H05G1/64

CPC分类号： A61B5/02007 ,  A61B6/032 ,  A61B6/481 ,  A61B6/504 ,  G06T5/004 ,  G06T5/20 ,  G06T7/0012 ,  G06T7/11 ,  G06T7/40 ,  G06T11/008 ,  G06T2207/30004 ,  G06T2211/404

摘要： An X-ray CT apparatus includes a unit which extracts a high-contrast region of comparatively high X-ray attenuation coefficient from an image, units which generate an unsharp image concerning the high-contrast region, on the basis of the position of the extracted high-contrast region and a point spread function peculiar to the apparatus, and a unit which subtracts the unsharp image from the original image in order to generate a low-contrast image concerning a low-contrast region of comparatively low X-ray attenuation coefficient.

摘要翻译： X射线CT装置包括从图像提取具有较高X射线衰减系数的高对比度区域的单元，基于所提取的位置，生成与高对比度区域相关的反锐化图像的单位 高对比度区域和设备特有的点扩散功能，以及从原始图像中减去不清晰图像的单元，以便生成与低对比度区域相对较低X射线衰减系数的低对比度图像。

公开(公告)号：US20110075905A1

公开(公告)日：2011-03-31

申请号：US12882876

申请日：2010-09-15

申请人： Yasuhiro NOSHI ,  Satoru NAKANISHI

发明人： Yasuhiro NOSHI ,  Satoru NAKANISHI

IPC分类号： G06K9/00 ,  A61B6/03

CPC分类号： A61B6/032 ,  A61B6/4233 ,  A61B6/466 ,  A61B6/5241

摘要： According to one embodiment, an X-ray computed tomography apparatus includes an X-ray generating unit and an area detector. The reconstruction processing unit reconstructs first and second volume data including an overlap region. The extraction unit extracts first and second slice images from the first and the second volume data respectively. The calculation unit calculates the difference value between a sum of pixel values in the first slice images and the sum of pixel values in the second slice images. The determination unit determines whether the difference value falls within a predetermined range. The combining unit combines the first and second volume data and sets a pixel value in the overlap region to a pixel value of the first volume data, a pixel value of the second volume data, or a value derived from pixel values of the first and second volume data.

摘要翻译： 根据一个实施例，X射线计算机断层摄影装置包括X射线产生单元和区域检测器。 重构处理单元重建包括重叠区域的第一和第二体数据。 提取单元分别从第一和第二卷数据提取第一和第二切片图像。 计算单元计算第一切片图像中的像素值之和与第二切片图像中的像素值之和的差值。 确定单元确定差值是否在预定范围内。 组合单元组合第一和第二体积数据，并将重叠区域中的像素值设置为第一体积数据的像素值，第二体积数据的像素值或从第一和第二体积数据的像素值导出的值 卷数据。

公开(公告)号：US07848480B2

公开(公告)日：2010-12-07

申请号：US11776866

申请日：2007-07-12

申请人： Satoru Nakanishi ,  Naruomi Akino ,  Yasuo Saito

发明人： Satoru Nakanishi ,  Naruomi Akino ,  Yasuo Saito

IPC分类号： A61B6/03

CPC分类号： A61B6/4014 ,  A61B6/032 ,  A61B6/541

摘要： An X-ray CT scanner includes X-ray tubes including a first X-ray tube and a second X-ray tube having fan angles different from each other, X-ray detectors including a first X-ray detector and a second X-ray detector which are respectively arranged to face the first X-ray tube and the second X-ray tube, collection data processing means for executing weighting processing to each of pieces of collection data including first collection data obtained by the first X-ray detector and second collection data obtained by the second X-ray detector to generate image data combined to be smooth in a direction corresponding to a channel direction of detection elements provided in the X-ray detectors, and image generating section for performing processing including image reconstruction processing with respect to pieces of collection data weighted by the collection data processing section to generate image data.

摘要翻译： X射线CT扫描器包括X射线管，X射线管包括第一X射线管和具有彼此不同角度的扇形角的第二X射线管，X射线检测器包括第一X射线检测器和第二X射线 检测器，其分别布置为面对第一X射线管和第二X射线管，收集数据处理装置，用于对包括由第一X射线检测器获得的第一收集数据和第二X射线检测器的第二收集数据进行加权处理 通过第二X射线检测器获得的收集数据，以生成在与设置在X射线检测器中的检测元件的通道方向对应的方向上平滑化的图像数据;以及图像生成部，执行包括图像重建处理的处理 由收集数据处理部分加权的收集数据片段以生成图像数据。

公开(公告)号：US20100183218A1

公开(公告)日：2010-07-22

申请号：US12487958

申请日：2009-06-19

申请人： Takashi Naito ,  Shinichi Kojima ,  Satoru Nakanishi ,  Isahiko Tanaka ,  Junya Kasugai ,  Takuhiro Omi ,  Hiroyuki Ishizaka

发明人： Takashi Naito ,  Shinichi Kojima ,  Satoru Nakanishi ,  Isahiko Tanaka ,  Junya Kasugai ,  Takuhiro Omi ,  Hiroyuki Ishizaka

IPC分类号： G06K9/62

CPC分类号： G06K9/00281

摘要： An object determining device includes imaging means for obtaining an image of the object, likelihood value calculating means for calculating a first likelihood value for the object shown in the image by use of the image obtained by the imaging means and a machine learning system and for calculating a second likelihood value for the object shown in the image by use of the image obtained by the imaging means and another machine learning system, the first likelihood value indicating a level of likelihood that the object is wearing the covering and the second likelihood value indicating a level of likelihood that the object is not wearing the covering, and determining means for determining whether or not the object, shown in the image obtained by the imaging means, is wearing a covering, on the basis of a ratio between the first likelihood value and the second likelihood value.

摘要翻译： 对象确定装置包括用于获得对象的图像的成像装置，似然值计算装置，用于通过使用由成像装置获得的图像和机器学习系统计算图像中所示的对象的第一似然值，并计算 通过使用由成像装置获得的图像和另一机器学习系统的图像中所示的对象的第二似然值，第一似然值指示对象佩戴覆盖物的可能性水平，第二似然值指示第 以及确定装置，用于确定由成像装置获得的图像中显示的对象是否穿着覆盖物，所述确定装置基于第一似然值和 第二似然值。